You can read the Instruction here.
I am very pleased. Here are some pointers:
-'Stable groups' asking for the Traditional Mass need not predate the Motu Proprio; they need not come from the same parish, or even diocese; they may be 'small'.
-The authority of the PCED against restrictions places on the TLM by bishops is affirmed.
-The freedom of the pre-conciliar rites of religious orders is affirmed.
-Altar girls, EMHCs and the like are ruled out.
This is a heavy blow for the opponents of the Traditional Mass.
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Update: here's an interesting point from the New Liturgical Movement:
UPDATE: Our own Fr. Augustine Thompson, O.P. notes that the Latin text is more clear.
34 – Sodalibus Ordinum Religiosorum licet uti propriis libris liturgicis anno 1962 vigentibus.
Father Augustine provides us with his own, more literal translation:
Members of religious orders may use their own liturgical books as in force in 1962.
As Father Augustine highlights, it is the word "sodalibus" which is lacking in the English translation which causes the seeming ambiguity, but which is important, for by that word, reference is made not simply to the religious orders as entities, but rather and specifically to the members of the religious orders. The implication, therefore, is that the use of those liturgical books is determined by the individual members of the Order.